Leather-working machine



Sept. 11, 1928. 1,683,704

- G. A. SCHETTLER LEATHER WORKING MACHINE Filed Fe 1925 2 Sheets-Sheet 1 Sept. 11, 1928. 1,683,704

G. A. SCHETTLER LEATHER WORKING MACHINE Filed 1925 2 Sheets-Sheet 2 mum mm Patented Sept. 11, 19 28.

UNITED STATES PATENT OFFICE:

Rm; mANNI'NG MACHINERY cdfiPAN'iz, i? PORTLAND, MAINE, A CORPORATION OF MAINE.

iiaii hiiii-ii iinxiiii iiiiAtiiiIiiiE'.

b iijil icatibn filed fehruaz y 9, sin-151 1% Gi -e 51: i

ions as unhziiring fleshlhg, shav ng ahd other an aloghiis epel a'tloris, and particularly to mat nee hf the typje hi whieh the Wei-k i' fed by feed-rolls iii-ringed t0 digit? it between 2ibhiiieti eylih cler tihd a be d-i'bl'l.

1h z'naehihes for the phi'pdsestdteii the bladed cylinder '01 cylin der, if there are more thzih one, aie (ii'iven in thedirectibii o 'iposite to the d ii'ehtien ih Which-the vdi'k is fed. and it is thereftire iiecesi ziry t0 nihim tain the il eeiil-rells' ili the nbet effeetive relatihh tb grip and. feed the ii qilgfdi bthi'ifise the counter-active effect the bladed evlhlder 01" eyhhdei's weiiltl fretiiihtlj trpet the 'pi-ogess; (if thevs orli afid fetzird the n-d'rhietien and cause some pail-ts of the iterk" to be Operated 'bIi than othei i. These dbjeetimiehle li'esqlts t re usually paused by VitlihilOIiS 1n the thlckhes i the bed roll an d the cylinder are di'g aiiizi'ed t0 l mintain a considerable pressure upoh the Wink mid s ihee greater tiactive foi'ce 1 'eqitired to draw the thick areas of the vork between the bed-1'01]: arideyhl'ider thztntd (if-aw the thinner aiea's and the ideas efuhi "r'm'm thieknes between thehlr 'FLii-therihdr; the tehien heeesziry t0 draw the stock be.

tween the cylinder and'th'e bed-i611 i s0 grip and therefore s'liihstantizflly dtiiible the tlZLCiLiVG force affoi'ded by a :singIepa-ii" (if feed-foils. i

In one u'spect the pfeiseiit invehtiofi iseencernefl ivith 2'1'11 'orgz'thiz'at loh of the tj pe 06mprisihf three 01' more cqeperatlve feed-rolls grip on 015552 Qf th eh fasjfbove p'einted'out; and in this connection m ebjeet (if the i i ventieh is topr'oVide ah improved' -gufrfln ge mm for relative yielding of 21 Working i'r'i "f theivork, since.

sti tipieiitality1111i] a gieuii 6f fe regb'eet t0 GtiCh jO'thelfQ While a t seething s niootl 'es in theh H e peratibil bf the as p'rbvide fer imdatctibn 6f customary to provide a bed-roll in addition to the full complement of feed-rolls. Still, the aforesaid feature of organizing the rolls to yield collectively with respect to the working cylinder or vice versa is advantageous whether the bed-roll is additional to and distinct from the grip and feed-rolls or whether it is used to do double duty as a bed-roll and as a feed-roll, and accordingly it is not to be understood that the invention is limited to one or the other of said types of roll organization.

Again, in machinesqof the type under discussion it is necessary to retract certain of the rolls that coact to grip and feed the work and to separate the bcd roll and cylinder for the purpose of-presenting the stock to the latter, and another object of'the in- .vent1on is to provide improved mechanism for effecting the described movements of the rolls. In moving certain of the rolls to workr'eceiving position, one of the latter, hereinafter termed the work-presenting roll, moves toward the position where the opera torusually stands to facilitate the placing of a piece of work thereon. When the operating mechanism is set in motion this work-presentingroll carries the piece of work toward the working cylinder, the workman meanwhile holding the leading portion of the work manually upon the work-presenting roll while the trailing portion hangs in position to be presented to the working cylinder. "lheoperating' mechanism not only furnishes the motion necessary to present the work to the working cylinder but also furnishesthe motion or motions necessary. to place one or more other rolls in cooperative relation to the work-presenting roll for the purpose of grippingand feeding the'work as hereinbefore explained. Further, the operating mechanism maintains its connection with the various rolls so that'smoothness in the operation of themachine' is obtained without anyfof the clashing of gears moving into mesh with each other as in'certain prior constructions.

' In accordance "with another feature ofthe invention the illustratcdmachine comprises togglesfor movingthe work-presentingroll toward and fromthe working cylinder, said toggles being arranged to extend, when straightened,nearly if notquite in register with a lineintersecting the axes of the bedroll and the cylinder. By reason of this arr'angement of the togglesthey lie, when straightened, substantially in line with the direction of thrust produced by a thick area of the stock passing between the cylinder and the bed-roll, and sincethey are therefore in position to sustain such thrust direct- 1y a corresponding reduction maybe made in the weight of other parts of the mecha- IllSlD.

Still another object isto provide an'im proved arrangement of the rolls when they are separated, to the end that the workn'ian may have the most advantageous disposition of the spaced rolls upon which to place the work before the rolls close uponv it,'whercby introduction of the workis facilitated.

In the attainment of the last-named object features of the invention consist in an organization comprising a stationary feedroll arranged above the cylinder, a bodily movable presenting roll ar anged-to carry the work to the cylinder and the stationary feed-roll, and a bodily movable grip-roll under which the presenting roll passes and which moves from an inoperative position to an operative position upon the upper half of the presenting roll, the arrangement being such that when the presenting roll and the grip roll are in. their retracted workreceivmg positions they are widely spaced from each otherand from the bladed cylinder thereby facilitating introduction of the work.

Other features of the invention are herein-- after described and claimed and are illustrated by'the accompanying drawings.

Referring to the drawings, I

Fig. l is an'end elevation of a portion of a machine constructed and organized accord ing to the present invention;

Fig. 2 is a diagrammatic view showing in solid lines the positions of the several workengaging rolls when the machine is open,

that is, when the rolls are separated from each other to facilitate the insertion of a piece of work; broken lines in this figure represent the working positions of the movable rolls; s i

Fig. 3 is a. view similar toFig. 1 except that it represents the machine in closed position and includes a more complete showing of the various driving connections by which rotation is transmitted and distributed;

Fig. 4 is a diagran'nuatic view of the workengaging rolls in their closedor working relation and corresponds to Fig. 3;

Fig. 5 is a front elevation in which the mid-portion of the machine is broken out and the endportions ar 'anged adjacent to each other to save space on the thawing; and

Fig. 6 is a vertical section, on a larger scale, of an assemblage that operates at the right of Figs. 1 and 3. I

The illustrated machine comprises two main frame members or standards '10, 10 connected and braced in any suitable manner. A working instrumentality or means for operating directly on the work is shown in the illustrated machine as a bladed working cylinder 12 (Figs. 1 and 3) which is carried by a shaft 14 mounted in stationary bearings 16 fixed respectively to the frame members 10. The power for operating the machine is applied primarily to the shaft 14; which is rotated at highspecd and from which rotagearing, hereinafter siiitahle reducing '(lescrihed, to operate mechanism by which tion is transmitted the feed-rolls and the the movable rolls are their respective operating positions.

All the rolls, which are heminafteidescribed individually, are organized to yield collectively, or as a unit, away from the bladed working cylinder, in consequence of variations in the thickness of the Stock passing the cylinder, and as shown the roll oi-= ganization is supported by horizontally yield'able structure arranged to slide oil guides 18 (Fig. 5) formed on 01- afiiXed to the frame members 10. description Will deal specifically with the fea= tures of construction at one eild only of the machine, since it may be readily understood that with the exception of the gaming meet of the elements are duplicated at the opposite end of the machine I (Figs. 5 and 6), and a The rollsupporting structure comprises bolsters QOalranged to slide oil the guides 18 -arriage 22 su ierposed upon the bolsters 20. The carriage 22 and the bolsters 20 are formed with cooperative dovetail formations indicated at 24: in Fig. 5 which enable the carriage to slide horizontally toward and from the workin cylinder 12. Arms 26 are formed 611 or itlllXBCl t0 the bolsters 20 and extend upwardly to sup= port bearings for the shaft 28 of a stationary feed roll 30 which )leferably has a fluted periphery. This iol is described as station aiy because it does not move except to rotate and to yield with the other rolls as afore said, or individually, as the ease may be, to the denlands of variatiohs in the thickiiess 0f the stock. To provide for ihdividtial yielding of the roll 30 its earifigs 3 2 (Fig. 5) are arranged to slide in parallel guides formed in the upper ends of the sunset and are forcedl downwzir'dly at'an inclination by compression springs 34. The tipple'r ends of the springs are seated against ad dstable bars 36 which pret'ide for regulating the i applied force of the spril'ig's.

Liitgs 38 are' forii'ie'd on the-bolsters 550 and are located at the ffroht of the machine which. according to Figs. 1 and 3, is at the right.-

These lo s are bored to receive rod-s 40Which extend through them' horizontally ahd are fixed to theframe members 10. (joiiipi'essioh springs 42 surround the rods and are seated a ainst the lugs 38 and againstadjlistztb'le ahutments 14 for the purpose of urging the roll-supporting sti'ir'icture toward the work ing cylinder, forward ends of thei-ods- 40am provided With screw-threads te'eoop': crate with internall threaded-haiid wheels Hilary which the ahut'n'ients i'i may he aidjusted to regulate the applied force of the s reason of the yielda'ble mount the bolsters 2'0 the feed-roll 30 is ada t ed to yield horizontall in addition to, and

moved to and from For cohvenience the tions, as shown by independently of, the ihdividttal yielding movement alleifded by the bearings '32 and springs at the uppei' ends '0 the arms 26; The m'oveii'ieh't of the bolsters 20 toward the working cylinder is limited by abutnlehts 1 8 which, as shown by Fig-me B, are liii'ts coop eratii'i'g with scretwthreads on the rods 40 relativel slightor-local irregularities in the reverse surface of the stock. The shaft 54 (Fig. 1)" of the roll '52 is journaled in bear ings fixed to or formed in the carriage 22.

Siiitable nechanism, hereinafter described, is provided to move the carriage 22 toward the front of the machin for the reception of a hide or skin, aiidtoii 'ard the rear of the machine to present the hide or skin to the bladed cylinder and to place the bed-roll 50 in ositio to coact with the cylinder.- The the thickh'e'ss of stock,

carriage22 is proyided with adjustable stopsciews 56 F ig. 3) arranged to abut the sup 7 ports or earings for the main cylinder.

These screws 56 may be adjusted to prevent the bed roll from eontactin with the cylinderwhen stock is between them. When the rolls occu'py their respective operative posi- Fig. 4, the preseiiting roll 52 coacts with the feed-roll 30 to grip the stock, and since these'l'olls by geariiig hereinafter described they coac't also to draw the work between the 'c'ylirider and the bed-r011. 1 l Y Additional t'factive force is'applied to the work by 51 inoi able feed-roll '58 which is preferably fluted and with which the presentirig roll 52 also coaets. The shaft or trimniol'is 60 that carry the roll 58 are liournaled in swing arms 61 and these arhis tire u'i'anged to swing ripen the shiifiiQS which seire's a fulcrum for this pet-pose. 'lh'c mechanism hereiniifter' described for moving the carriage from its operative position. and: the swinging" are both driveii moyei'ne'nt of this roltis suehthat when the rolls z'iite'in; their open 1: o sitions, that is, sepa- N rated for the insertion of a piece of worlgthe roll 58 is elevated, asshown by F i51 1 and by a contiiitlmis liiife iii- Fig. 2. hiis, the workresenting roll 52', in movlfig from its workreceiving position=- to its work pi'esentiflgt positiehr', passes under the swingingjeil 5e whil the latter is descending, and when the rolls are in their operative positions both the ,riage 2-2 by a pivot stud 70.

stationary roll 30 and the swinging roll 58 cooperate with the upper half of the roll 52. The mechanism for moving the carriage comprises toggle, members 62 and (J-l connectcd by a stud 66 to form the knee of the toggle. The toggle member (32 is anchored to the adjacent bolster 20 by a pivot stud (58 while the member (54. is connected to the car- The motion for operating the toggle members is provided b a crank 72 carried by a shaft 74, said sha t icing journaled in hearings in the frame members 10. A connecting rod 76 is connected at one end to the crank 7 2 and at the other end to the toggle member 62 by a pivot member 7 8. This mechanism is so organized that when the pivot 66 or knee is moved to the dead-center position to place the bed-roll and the work-presenting roll in their operative positions (see Figs. 3 and 4) the three pivots oi? the toggle are substantially in line with the direction of thrust produced by a thick spot passing between the working cylinder and the bed-roll. ber 62 is connected to the swing arm 61 by a link 80 to move the roll 58 to and from its operative position. As shown, the lower end of the link 80 is connected to the toggle member by a pivot 82 but the connection between the link and the swing arm (51 provides for upward yielding ofthe roll 58 relatively to I the roll 52 to compensate for variations in the by the bed-roll 50. With condition the knee 66 of the toggle is on deadcenter, in consequenceot which the carriage entire assemblage of feed-rolls,

thickness of stock passing between them. For this purpose the outer end of the swing arm 61 is provided with a pivoted sleeve Sal through which the link for relative sliding movement of thesleeve and the link. An adjustable abutment comprising a pair oi nuts 86 is carried by the link in position to engage the lower end of the sleeve, while a compressionspring S8 bears downwardly upon the upper end of the sleeve to maintain the latter normally in contact with said abutment. The spring is held under initial compression by an adjustable abutment 90 fastened to the upper end of the link. V i l Assuming that the machine is in operation with the rolls in the positions shown in Figs 3 and 4, the hide or skin, having been properly suspended upon and held manually in cooperative relation to the presenting roll 52, is gripped along one line by the coaction of the rolls 30 and 52 and along another line by the coaction of the rolls 58 and 52.. At the same time the pendant portion of the hide or skiniis pressed against the working cylinder the machine in this 22 is rigidly sustained relatively to the bolsters 20, but since the latter. are sustained by the compressionpsprings 42,.the. bed-roll, the the carriage Furthermorqthe toggle memextends to provide ually to accommodatevariations in the thickness of the stock passing between it and the presenting roll. Still, the gripping pressure of the rolls 30 and 52 and that of the rolls 58 and 52 is not aiiected by displacement of the carriage 22 when a change of tl iiekness oc' curs between the cylinder and the bed-roll 50 because the rolls 30 and 58 partake of such displacement to the same extent as the rolls 50 and 52.

Gearing is provided for driving the roll 30 continuously and for driving the rolls 52 and 58 when they occupy their respective operating positions, but as to the two latter rolls the driving transmission is interrupted incidentally to moving them to their inoperative positions. The working cylinder '12 is driven continuously at high speed and is used to transmit rotation to the feed rolls by gear.- ing (Fig. 3) including a sprocket wheel 91, chain 92, sprocket wheel 93, pinion 94 fixed relatively to the sprocket 93, gear 95, sprocket wheel.96, chain 97, and sprocket wheel 98. Cooperative spur gears 99 and, 100 are fixed respectively to the rolls 30 and 52 and are operatively engaged and disengaged by movements of the carriage 22 relatively to the bolsters 20. The gear 100 serves also to transmit rotation to the roll 58 which is provided with a gear 101 and which is operatively connected and disconnected by swinging movement of the arms 61. 3

The chain 97 runs on an idle sprocket 102 which isadjustable to regulate the tension of the chain. For this purpose the stud 103 by which the idle sprocket is supported is arranged in a slot 104 of a bracket 1 05, and an adjusting screw 106 is screwed through a portion of the bracket and engages the said stud.

According to usual practice the machine may be provided with clutch mechanism for driving the crank-shaft 74. Preferably such mechanism would include a start ing treadle and means for automatically declutching the crank-shatt at the end of every half rotation so that it would dwell in each of the positions shown by Figs. 1 and 3. The drawings do not include any clutch mochanism since any suitable type may be used. For example, that shown and described in Letters Patent of. the United States 696,588 could be used. Still, Fig. 3 includes gearing by which rotation may be transmitted to operate the crank-shaftfli through the meity and an organization of Work-engaging rolls, which instrumentality and organization ere yleldable relatively one; to the other durii o --I''a,tio11 of the machine to coin 9e11- sate for variations in thickness of the sheet material beingworked by said instrumentality, one of said IOlzlS being arranged to coact with, said insti'unientelity to form :a working coi-iple, end a plurality of said rolls being arranged: to coact with-one of said rolls on a plurality of separate lines togrip the sheet material andufeed it past said instrumentality, one of the Work-engagingrollsrcniai-ning stationary with respect to, the Working instruinentality While others. of the rolls move away therefromtoWork-reoeiving position to permit sheet material to be introduced a into the machine.

2; At machine for operating upon sheet material, comprising a. Working instrumentality and anorganization of Work-engaging rollsarnanged to. yield as a unit relatively to said instruinentality owning-operation 0f the machineto compensate for variations in thickness of the sheet material: being Worked by said instnmnentnltity one of said rolls being arranged to conct: w'i thisaid instnwnental-ityto. torni aotorhingigi couple, and a plurality of said rolls being arranged a to: coact with one oft-said nolhitogrip the sheet initteriial on separate: lines and" feed the" sheet material past said inst-ruinentality, one of the workeengwgingnollsreinniningstationary above the working instrun'ientality wizhile othersot the rolls mono angayi thifillip-Qlll-IO work-receiving position tor-permit sheet material to be engaged withthe workengaging rolls. 7

3; A. machine for operating on sheet material, comprising aworking instriunentality, v 7

an" organization t of" work-engaging rolls, said instrulnentality and: said .organizationbeing relatively yieldable to compensate for variations inthickness off the sheet material being Worked by said instrumentality, one of" said rolls beingarranged to coact with said instrumentality to formza wonking couple, a plurality of said rolls being arranged to coaot with one ofsaid rolls to grip the: sheet material on separate lines and tofeed the sheet material past said Working instrunientality, and n eans arranged tomove twoof said rol ls bodily awayfrom and 'toward said inst-ruwith said; cylinder to: term; and a plurality of said roll-s being arranged mentality and also; bodily away from and toward one or more others o l Sitltl rolls to provide for introducing the initially tween the rolls an d for present ng; the Work to said instrumentality. i of i i. A machine for operating-on sheetmate ia mp sing: at working instrumentality, and a yieldable unitincluding worlvcngaging rolls and means for sustaining them in- .their respective operative positions, one of; said work-engaging rolls being bodily movable to present the work to plurality of said work-engaging rolls being arranged to coact with said one togrip. the Work on separate lines and feed the work,

and one of said Work-,-engaging rolls being arranged tocoactWlth' saicliinstrumentality to form a orking couple. a, a t

5,. Aleather-Working machine comprising a working cylinder, and ayielda'ble unit inc ud ng 'orl engeging r lls and means for sustaining them in their respective operative pos t ons, one, of said rolls being bodily movable to present the Work tosaid cylinder, a plurality of said rolls being; arranged to, ooact with said one to grip'and ileodl the, Work, and n of said rolls bcingarrang d to c ect with said cylindert-o form a worklng' couple.

6., A leatherwvorking inaehine comprising a Working cylinder, end y eldable; unit 111- ludlng WOL'lQ-GDgi qing tolls; and means for sustaining: them in lillfill" respective operative positions, one ofsaid rolls being bodily movable to; present the work; to; saic'tcyliinder -another of said rolls beingarranged to coach aworking couple,

to coact one with another to grip and feed the Work. 1 a f 7. A leatherswork ing machine comprising-m orking cylinder anda yieldableimit includsaid instrumentality, a

111g Work-engaging roli sand ineensior sus tainingthemin their respective: op emcee p0- sltlons, one of saidrolls. being bodily: movable to present the Work to. said cylinder, phi-- rality of said rolls beingnrranged to) coact wit-hsaid one tor-grip. and feedthe work and being individuallyyieldable relatively to said one,-an,di one of said rolls'being arranged to coaet with said cylinderto fonna working couple. i

8: A leather-Workinginaehine comprising a workingcylinden, and a yield-able unitiincliuding: Worksengagingrollsand means for sustaining them in their respective operative p0,-

sition's, one of said: rolisbeing: bodily movable to present tl18.W O1'li to; said cylinder, another of said rolls being stationary and arranged to coactwi-th said onietogrip and-feed the work, anothenofsaid rolls being bodily lnonable and'arranged to, coact withsaid. oneto grip and feed the-woi lg a-nct one-of said rolls being arranged to coact withsaid cylinderto form a Working'couple. I

9. A leather-Working machine" com-prising a working cylinder, and a yieldablc unit ineluding work-engaging rolls and means for sustaining them in their respective operative positions, one of said rolls being bodily movable to present the work to said cylinder, a

plurality of said rolls being arranged to coact cluding work-engaging rolls and means for.

sustaining them in their respective operative positions, one of said rolls being bodily movableto present the work to said cylinder, an-

' other of said rollsbeing stationary and arthickness of stock passing ranged to coact with the upper half of said one to grip andiecd the work, another of said rolls being bodily movable and arranged to coactwith the upper half of said one to grip and feed the work, and one of said rolls being arranged to coact with said cylinder to form a working couple.

11. A leather-working machine comprising a working cylinder, and a yieldable unit including work-engaging rolls and means for sustaining them in their respective operative positions, one of said rolls being bodily movable to present the Work to said cylinder, two of said rolls bein arranged to coact with said one to grip and l ced the work, and being individually yieldable relatively to said one, one of said two bein stationary and the other being bodily movabi to and from operative positiomand one of said rollsbeing arranged to coact with said cylinder to form a working couple. v

12. A leather-workin machine comprising a working cylinder, and a yieldable unit including Work-engaging rolls and means for sustaining them in their respective operative positions, one of said rolls being bodily movable to present the work to said cylinder, two

of saidrolls being arranged to coact with said one to grip and feed the work, and being individually yieldable relatively to said one, and one of said rolls being arranged to coact with said cylinder to form a working couple.

13. A leather-working machine comprising a working cylinder, and work-engaging rolls one ofwhich is arranged to press the work against said cylinder, and a plurality of which are arranged to cooperate with each other to grip and'feed the work, said rolls'being .arranged to'yield' as a unit relatively to said cylinder in consequence of variations in the between said cylinder and said one of said rolls, one of the workengaging rolls remaining stationary with respect to theworking cylinder while others of the rolls move away therefroin to work-re-,

ceiving position to permit the work to be introduced into the machine.

14. A leather-working machine comprlsyield collectively in ing two cooperative units one of which is yicldable relatively to the other, one of said units COlllPl'lSlIlg a working cylinder and the other comprising a group of work-engaging rolls of which one is arranged to coact with said cylinder and of which a plurality are arranged to cooperate with each other to grip and feed the work, said plurality of rolls comprising a roll stationary above the working cylinder while the others move away from and toward said stationary roll and cylinder to receive and topresent the work to the cylinder and to the stationary feed roll.

15. A leather-working machine comprising a working cylinder, work-engaging rolls one of which is arranged to press the work against said cylinder, and a plurality of which are arranged to cooperate with each other togrip and feed the work, a slidably-mounted carriage for supporting said one roll, and mechanism also supported on the carriage and arranged to move said one of said rolls to and from its operative position, said rolls and said mechanism being organized to yield collectively in one direction in consequence of variations in the thickness of stock passing between said cylinder and said one of said rolls.

16. A leather-working machine comprising a working cylinder, and work-engaging rolls one of which is arranged to press the work against said cylinder, and a plurality of which are arranged to cooperate with each other to grip and teed the work, and toggles arranged to move said one of said rolls to and from its operative position, said rolls and said toggles being arranged to yield collectively in one direction in consequence of variations in the thickness of stock passing between said cylinder and said one of said rolls.

17. A leather-working machine comprising a working cylinder, and work-engaging rolls one of which is arranged to press the work against said cylinder, and a plurality of which are arranged to cooperate with each other to grip and feed the work, and toggles arranged to move said one of said rolls to and from operative position and to stand substan tially in the dead-center position when said one of said rolls stands in operative position, said rolls and said toggles being arranged to a the direction of the deadcenter line of the toggles in consequence of variations in the thickness of the stock passing between said cylinder and said one of said rolls. g y a 18. A leather-workingmachine comprising a working cylinder, and work-engaging rolls one of which is arranged to press the work against said cylinder, and a plurality of which are arranged to cooperaterwith each other to grip and feed the work, and toggles arranged to move said one of said rolls to and from operative position. and, when straightened, to extend substantially in line with the direction of thrust produced by a thick area ion yield relatively to said cylinder, a carriage of the, stock passing between said cylinder and said one of said rolls, said rolls and said togbeing organized to yield collectively in said direction. I r

19, A leather-working machine comprising a working cylinder, a plurality of work-engaging rolls one of which is arranged to coact with said cylinder and a lurality of which are airangeiil to grip and reed the work, and mechanism arranged to move a plurality of said rolls yieldably toward their respective operative positions and in the reverse direction to provide for insertion of the Work, said mechanism being yieldable and being organized to constrain said rolls to yield collectively in one direction in conseqnenee of variations in. the thickness of stock passing between said cylinder and said one of said rolls.

20. .A leather-workingmachine comprising a working cylinder, a plurality of work-engaging rolls oneof which is arranged to coact with said cylinder and a A lnrality of which are arranged to grip and Feed the work, and mechanism arranged to move a plurality of said rolls. to and from their respective opera tive positions to provide for-insertion of the work, said mechanisnrincluding toggles arran ed to move said one of said rolls, said rolls and said toggles being organized to yeild collectively in one direction in conseqnence of variations in the thickness of stock passing between said cylinder and said one of said rolls.

21 A lcather-working machine{comprising a working cylinder, a, yieldable roll-supporting structure, cooperative work-engaging rolls one of which is arran *d to coact with said cylinder and a plnral tyof which are arranged to cooperate with each other to gripand feed the work, toggles anchored to said yieldablc structure and OPEITtttlVGlY connected to said one of said rolls to move it to and from operative position, and connec tions tro'msaidtogglcs to another oisaid rolls to move it to andlron its operative position, said"roll-supporting strncinre, said'rolls, said toggles and said connections being organized and constrained to yield collectively in one direction in conseducnceot variations in the thickness of stock passing between said cylinder and said one of said rolls. 7

22. A leether-working machine comprising a frame, a working cylinder join'naled therein, a snppoitim i iuctnre arranged to movable toward and tron'i said cylinder, work-engaging rolls which one is carried by said supporting structure a d of which a plurality are jonrnaled in said carriage and arranged to coact with said one to grip and feed the work, one of said rolls being arranged to coact with said cylinder to term a working conple,-and mechanism connecting said. supporting strncture and said carriag e and operable for moving the latter tomembers.

I riage, a work-presenting ward and from said cylinder, said incchan ism being arranged to constrain said lc rriage' to partake of yieldingniovement of d s pportngstrncture so that all said work-engaging rolls will yield collectively in one d.i--

rection in conseqnence of variations, in the thickness of'stock'passing between said cylinder and said one of said rolls.

23. A leather-working machine colnprisand arranged to coact with said work-presenting roll to grip and feed the work.

24. A leather-working machine comprising a working cylinder, a having a shaft, arms arranged to swing on saidshai't, a work-presenting roll movable bodily toward and from said cylinder and arranged to coact with saiCLfeed-roll to grip and feed the work, and a teed-roll join-naled in'said swing arms and arranged to coact with said work-presenting roll to grip and feed thework.

25. A leather-working machine coi npris ing a workingcylinder, a shaft, a feed-roll carried by said shaft, a work-presenting roll movable bodily toward and from said cylinder and arranged to coact with saidfeedroll to grip and feed the work, toggle members arranged to move said worlcpresenting roll as aforesaid, arms arrangedlo swing on said shaft, a feed-roll journaled in said arms and arranged to coact with said work-presenting roll to grip and feed the work, and links connecting said toggle inen'ibers with said swing arms to swing the latter said feedroll toward and from said work-presenting rollias the latter is moved by said toggle 26. A leather-working. machine comprising a working cylinder a yicldable support, at'eed-roll journaled in said support, a can riage, a work-presenting roll j'o'urnaledfin said carriage, toggle members connecting said yieldable support and saidcarriage to move said work-presenting roll toward and from said cylinder, mechanisinarranged to operate said toggle members,

links connecting said swing arms to move the latter, and a feed-roll jonrnaled in said swing arms to co act with said work-presenting roll to grip and feed the work, said work-presenting roll and the first said feed-roll being arranged to coact with each other to grip and 'feed the work. 7

27. A leather-working machine comprismg a working cylinder,

.a feed-roll, a car- IOllrJOUIIIZIlGCl in said carriage and arranged to coact with stationary feed-roll swing arms piv}; otally connected to said yieldable structure,

said toggle members and 7 said feed-roll to grip and feed the work,

yieldable anchoring means, toggle members connecting said anchoring means and said carriage, and mechanism arranged to operate said toggle members to move said work-presenting roll to and from co-active relation with said feed-roll.

28. A leather-working machine comprising a working cylinder, a feed-roll, a carriage, a work-presenting roll journalcd in said carriage and arranged to coact with said feed-roll to grip and feed the work, toggle members pivotally connected to said carriage to move said work-presenting roll to and from said feed-roll, mechanism arranged to operate said toggle members, and means comprising the carriage for mounting the feed roll and the work presenting roll so that they yield together and in the same direction to accommodate variations in the thickness dimension of the work;

29. A leather-working machine comprising a working cylinder, a feed-roll, a carriage, a work-presenting-roll journaled in said carriage and arranged to coact with said teed-roll to grip and feed the work, toggle members pivotally connected to said carriage to move said work-presenting roll to and from said feed-roll, mechanism arranged to operate said toggle members, a bodily movable feed-roll arranged to coact with said work-presenting roll to grip and feed the work, and connections operable by said toggle members to move the latter said feed-roll to and from coactive relation with said workpresenting roll.

30. A leather-working machine comprising a working cylinder, astructure arranged to yield relatively thereto, a carriage supported by and movable relatively to said structure, a feed roll journaled in said structure, a Work-presenting roll 1ournaled in said carriage, said rolls being arranged to coact to grip and feed the work, and mechanism arranged to move said carriage to shift said work-presenting roll toward and from said feed-roll.

A leather-working machine comprising a working cylinder, a support movable relatively thereto, a work-presenting roll journale'd in said support, a feed-roll arranged to grip and feed the work, a crank, and toggle mechanism operable by said crank and arranged to move said support to carry said work-presenting roll to and irom its operative position, and means including the movable support for mounting the work presenting roll and the feed roll so that they may yield together in the same direction with 'respect to the working cylinder.

32. A leather-working machine comprising a working cylinder, a movable support, a carriage movably mounted on the support, a bed-roll and a work-presenting roll both journaled in said carriage, said bed-roll being arranged to coact with said cylinder to form a working couple, a feed-roll arranged to coact with said work-presenting roll to grip and feed the work, toggle mechanism pivotally connected to said support, and mechanism arranged to straighten said toggle mechanism for the purpose of moving said bedroll and said work-presenting roll to their respective operative positions.

33. A leather-working machine comprising a working cylinder, a structure arr: ngcd to yield relatively thereto, a support arranged to move relatively to said structure, a work-presenting roll journaled in said yieldable structure and arranged to coact with said work-presenting roll to grip and feed the work, toggle members connected at one end to said yieldable structure and at the other end to said movable support, mechanism arranged to straighten said toggle members to move said work-presenting roll to its operative position, a bodily movable feed-roll arranged to coact with said workpresenting roll to grip and feed the work, and means operable by said toggle members to move the latter said feed-roll to and from its operative position.

In testimony whereof I have signed my name to this specification.

GUSTAV ADOLF SCHETTLER. 

